Lennart Poettering from Red Hat who develops and maintains PulseAudio has written a detailed explanation about the underlying technical improvements in the upcoming version of PulseAudio. "A while ago I started development of special branch of PulseAudio which is called glitch-free. In a few days I will merge it back to PulseAudio trunk, and eventually release it as 0.9.11. I think it's time to explain a little what all this 'glitch-freeness' is about, what made it so tricky to implement, and why this is totally awesome technology."

It came with my upgrade to Hardy, and it was just too bad.
Opening KDE4, Firefox and Skype at same time just did not worked, and cpu usage was getting high. It just seems like another implementation of a layer, much like arts for KDE3 was.
Just removed it and I'm happy with alsa-only again